e107: Unsafe deserialization in install.php allows unauthenticated RCE via POP chain
CVSS score
9.8
EPSS probability
—
Risk score
1.0
Published
12 h ago
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Impact on My Inventory
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
Prior to version 2.3.7, e107 CMS passes the unvalidated previous_steps parameter via install.php to unserialize(), leading to full system compromise risks.
Unauthenticated attackers can reach the vulnerable installer script to execute arbitrary PHP functions with web server process privileges, leading to full system compromise.
What should be done?
- Upgrade e107 to version 2.3.7 or later
- Verify the accessibility of the installer script
- Follow the vendor advisory
Chain of evidence and sources
e107 CMS, 2.3.7 öncesi sürümlerde install.php üzerinden gelen güvenilmeyen verileri serileşmeden çıkarır.
Kimliği doğrulanmayan bir saldırgan rastgele PHP fonksiyonları çalıştırarak tam sunucu ele geçirilmesine yol açabilir.
Show the technical text from the sources
e107 is a content management system (CMS). Prior to 2.3.7, install.php decodes the attacker-controlled previous_steps POST parameter and passes it to unserialize() at file scope and again in the e_install constructor without restricting allowed classes. The installer remains accessible after a normal installation, and a crafted object graph using the bundled GuzzleHttp\Psr7\PumpStream class can flow through paths.hash into site_path, where string coercion invokes an attacker-controlled callable. An unauthenticated attacker who can reach install.php can therefore execute arbitrary PHP functions with the web server process's privileges, leading to full server compromise. This issue is fixed in version 2.3.7.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-502
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-55573 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | e107inc | e107 | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.8 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD |
| 9.8 | CVSS V3_1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-55573 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-55573 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
e107: SQL injection in alt_auth plugin (otherdb / e107db backends) via login username
e107 Second-Order Code Execution via eval()-Based Deserialization in e_array::unserialize()
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